Systèmes-Q

ABSTRACT:
A q-system is a set of rules which allows certain transformations to be
carried out on oriented graphs. An expression with parentheses appears
on each arrow of such a graph. The transformation may correspond to an
analysis, a synthesis of a sentence, or to a similar formal
manipulation. It is possible to use the same q-system to describe both
a process and the inverse of this process, as for example the analysis
and the synthesis of a sentence.